JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jquery.validate/1.11.1/jquery.validate.min.js"></script>
<form id="myform">
    <input name="X2aasNr" type="text" value="" class="cleared" id="" />
    <br/>
    <input type="submit" />
</form>
<a href="http://docs.jquery.com/Plugins/Validation" target="_blank">Validation Documentation</a>

CSS

a {
    display: block;
    position: absolute;
    bottom: 0;
}

JavaScript

$(document).ready(function () {

    $('#myform').validate({
        submitHandler: function (form) { // for demo
            return false;
        }
    });

    $('input[name="X2aasNr"]').rules('add', {
        required: true
    });

});